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Power Racing Series

Modified on Sat, 29 Apr 2017 01:32 PM by Administrator Categorized as Uncategorized
Youtube video on taking transaxle apartWe are attempting to enter the Power Racing Series exhibition race at World Maker Faire, September 29th and 30th. 

Official Team Members:

  1. Rick
  2. Jean
  3. Bill

Several others have been helping out, including Brian, Rick, and Don -- Thank you!

Project Goals:

  1. Complete the race without breaking
  2. Maintain a "sleeper" appearance, staying true to the style, layout, and geometry of the stock unit
  3. Not be embarrassingly slow
  4. Surprising off-road capability
  5. Have a fun, reasonably safe toy at the end

Major Components:

  1. Structure - currently box steel, 1" and 3/4"
  2. Wheels / Tires - currently Harbor Freight DH 13" units: http://www.harborfreight.com/material-handling/pneumatic-tires/13-inch-x-5-inch-heavy-duty-pneumatic-tire-37767.html
  3. Motor(s) - currently CIM motors from andymark.com 12v overvolted to 24v, possible 36v unit from Don
  4. Steering - high rise handle bars
  5. Front Spindles - modified stock units, include basic ackerman
  6. Rear Alxes - either fabricated or old transaxle
  7. Seating - no ideas yet
  8. Power Transmission - Considering old riding mower transaxle
  9. Batteries - currently old UPS batteries (12v, 9ah) they all seem to be this model: http://www.apexbattery.com/vision-cp1290-battery-sealed-lead-acid-batteries-vision-batteries.html
  10. Motor Control - building homebrew, possible commercial unit(s) from Don
  11. Throttle / Brake interface - off the shelf scooter throttles, not sure about brakes!
  12. Moxie - thinking rolling subwoofer with remote dj capability

Transaxle Notes

Obtained an old 5 speed + reverse transaxle from a Craftsman 10HP riding mower. Apparently this transaxle is very common... ours has the name "Foote" on it.

Transaxle Diagram

Video on disassembling transaxle

Motor Control Notes


  • http://www.datasheetcatalog.org/datasheet/stmicroelectronics/9387.pdf (currently testing with)
  • http://www.fairchildsemi.com/ds/FQ/FQP50N06L.pdf
  • https://www.sparkfun.com/products/10213 (from sparkfun)

The Craigslist AdThe Craigslist Ad

Stock Unit


Battery Testing


ScrewTurn Wiki version Some of the icons created by FamFamFam.